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This is a first look at the brand new, Optolong L-Ultimate dual narrowband filer! Coming off of the success of the L-Extreme, Optolong has released the latest edition of its line of dual narrowband filter. The L-Ultimate sports a bandpass of just 3nm for both HA and OIII. #optolong #l-ultimate #williamoptics #redcat #nebula #veil #astronomy #astrophotography #lightpollution #deepsky #longexposurephotography
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